Detectability of inhomogeneities within highly diffusing media

Giovanni Zaccanti; Daniele Contini; Massimo Gurioli; Andrea Ismaelli; Heather Liszka; Angelo Sassaroli

doi:10.1117/12.210033

30 May 1995 Detectability of inhomogeneities within highly diffusing media

Giovanni Zaccanti, Daniele Contini, Massimo Gurioli, Andrea Ismaelli, Heather Liszka, Angelo Sassaroli

Proceedings Volume 2389, Optical Tomography, Photon Migration, and Spectroscopy of Tissue and Model Media: Theory, Human Studies, and Instrumentation; (1995) https://doi.org/10.1117/12.210033
Event: Photonics West '95, 1995, San Jose, CA, United States

Abstract

The effect of inhomogeneities within a highly scattering medium on the reflectance and on the transmittance was studied both with numerical simulations and with measurements on phantoms. A slab of diffusing medium with optical properties similar to those of a compressed breast was condidered. With an elementary Monto Carlo code the temporal point spread functions corresponding to photons emerging at different distances from the thin collimated light source were evaluated. For some detector positions, the coordinates of all the scattering points for each received photon were stored. Numerical simulations were carried out first for a homogeneous medium, requiring a few days for calculations. Using the stored trajectories it was possible to obtain in a short time, the corresponding temporal point spread functions when an absorbing inhomogeneity was considered within the slab. It was possible to obtain the temporal point spread function for many different positions, sizes, and shapes of the inhomogeneity inside the diffusing medium. The accuracy of the numerical results was checked by a comparison to experimental results obtained from measurements on suspensions of calibrated spheres having known optical properties. Measurements were carried out both with a picosecond system and with a continuous wave system.

Citation Download Citation

Giovanni Zaccanti, Daniele Contini, Massimo Gurioli, Andrea Ismaelli, Heather Liszka, and Angelo Sassaroli "Detectability of inhomogeneities within highly diffusing media", Proc. SPIE 2389, Optical Tomography, Photon Migration, and Spectroscopy of Tissue and Model Media: Theory, Human Studies, and Instrumentation, (30 May 1995); https://doi.org/10.1117/12.210033

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